Description
Magpul built the UBR Gen 2 for folks who want the rigid feel of a fixed stock but still need to adjust length of pull on the fly. It runs on a custom receiver extension tube that comes in the box, which is a big part of why the lockup feels so tight. Once you click a position into place, it stays put with no wobble, no rattle, and no set screws to fuss with. That solid, repeatable cheek weld across all its positions is what earned the original UBR its reputation, and this second generation keeps that going while trimming close to five ounces off the older model.
What Sets the UBR Gen 2 Apart
Unlike a typical collapsible stock that leans on a mil-spec buffer tube, the UBR Gen 2 mounts to its own reinforced receiver extension for that fixed-stock rigidity. You get seven length adjustments plus fully collapsed for eight total positions, and the adjustment lever only needs gross motor movement to release. The whole profile stays streamlined and snag-free, so nothing hangs up on gear or slings when you're moving.
Built to Take a Beating
This stock was engineered to handle large-bore AR recoil and shrug off hard impacts, the kind of abuse that shows up during malfunction clearing or serious range time. The angled-toe MOE SL rubber butt-pad gives you an anti-slip surface with extra impact protection, and the rollover on the toe makes shouldering easier when you're running body armor.
Sling Options and Storage on the UBR Gen 2
Magpul loaded this one with attachment points. You get front and rear QD sling sockets, a 1.25-inch bottom sling loop, and two footman's loops for cord or webbing. The tail houses a customizable storage compartment with a reversible, removable door, which is a handy spot to tuck a bore snake or small field kit. It fits AR-15/M4 and AR-10/SR-25 platforms and is made in the USA. Keep in mind you'll still need a carbine, SR-25, or A5 buffer and spring to run it, since those aren't included.
Key Specifications
- Manufacturer: Magpul Industries
- Model: UBR Gen 2
- Manufacturer Part Number: MAG482-ODG
- UPC: 840815101338
- Color: OD Green
- Style: Collapsible / Adjustable
- Fits: AR-15/M4 and AR-10/SR-25 platforms
- Buffer Compatibility: Carbine, A5, and SR-25 length buffer systems
- Positions: 8 total (7 adjustments plus fully collapsed)
- LOP Adjustment Range: 3.5 in.
- LOP, M4 Collapsed: Approx. 11.8 in.
- LOP, M4 Extended: Approx. 15.3 in.
- Length: 8.5 to 12.0 in.
- Max Width: 1.7 in.
- Weight w/ Receiver Extension: 21.2 oz.
- Country of Origin: Made in USA
What’s Included
- Magpul UBR Gen 2 stock assembly
- Custom receiver extension tube
- Buffer spacer
- Mounting hardware
- MOE SL angled-toe rubber butt-pad (installed)
Frequently Asked Questions
Does the Magpul UBR Gen 2 come with a buffer tube?
Yes, the UBR Gen 2 includes its own custom receiver extension tube, a buffer spacer, and all the mounting hardware you need to install it. That dedicated tube is a big reason the stock locks up with fixed-stock rigidity. You will still need a carbine, SR-25, or A5 buffer and spring to run it, since those are not included.
What platforms and buffer systems does the UBR Gen 2 fit?
It fits AR-15/M4 and AR-10/SR-25 pattern rifles. The included receiver extension accommodates carbine and SR-25 length buffers as well as aftermarket A5 buffer systems, so you have options depending on how your build is set up. This gives you flexibility across both small-frame and large-frame ARs.
How many length positions does the UBR Gen 2 have?
You get seven length-of-pull adjustments plus a fully collapsed setting, for eight positions total. The adjustment lever only takes a gross motor movement to release, and each position clicks in with no wobble once locked. That repeatable feel is exactly why the UBR line built its reputation.
Is the UBR Gen 2 lighter than the original UBR?
It is, by roughly five ounces, while keeping the same tank-like durability the original was known for. Magpul redesigned it to handle large-bore recoil and severe impacts without the extra bulk. The result is a rugged stock that feels solid without weighing down the back of your rifle.







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